/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sun.org.apache.xml.internal.security.keys.content.keyvalues;

import java.math.BigInteger;
import java.security.Key;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;

import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.I18n;
import com.sun.org.apache.xml.internal.security.utils.SignatureElementProxy;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class RSAKeyValue extends SignatureElementProxy implements KeyValueContent {

  /**
   * Constructor RSAKeyValue
   */
  public RSAKeyValue(Element element, String BaseURI) throws XMLSecurityException {
    super(element, BaseURI);
  }

  /**
   * Constructor RSAKeyValue
   */
  public RSAKeyValue(Document doc, BigInteger modulus, BigInteger exponent) {
    super(doc);

    XMLUtils.addReturnToElement(this.constructionElement);
    this.addBigIntegerElement(modulus, Constants._TAG_MODULUS);
    this.addBigIntegerElement(exponent, Constants._TAG_EXPONENT);
  }

  /**
   * Constructor RSAKeyValue
   */
  public RSAKeyValue(Document doc, Key key) throws IllegalArgumentException {
    super(doc);

    XMLUtils.addReturnToElement(this.constructionElement);

    if (key instanceof java.security.interfaces.RSAPublicKey) {
      this.addBigIntegerElement(
          ((RSAPublicKey) key).getModulus(), Constants._TAG_MODULUS
      );
      this.addBigIntegerElement(
          ((RSAPublicKey) key).getPublicExponent(), Constants._TAG_EXPONENT
      );
    } else {
      Object exArgs[] = {Constants._TAG_RSAKEYVALUE, key.getClass().getName()};

      throw new IllegalArgumentException(I18n.translate("KeyValue.IllegalArgument", exArgs));
    }
  }

  /**
   * @inheritDoc
   */
  public PublicKey getPublicKey() throws XMLSecurityException {
    try {
      KeyFactory rsaFactory = KeyFactory.getInstance("RSA");

      RSAPublicKeySpec rsaKeyspec =
          new RSAPublicKeySpec(
              this.getBigIntegerFromChildElement(
                  Constants._TAG_MODULUS, Constants.SignatureSpecNS
              ),
              this.getBigIntegerFromChildElement(
                  Constants._TAG_EXPONENT, Constants.SignatureSpecNS
              )
          );
      PublicKey pk = rsaFactory.generatePublic(rsaKeyspec);

      return pk;
    } catch (NoSuchAlgorithmException ex) {
      throw new XMLSecurityException("empty", ex);
    } catch (InvalidKeySpecException ex) {
      throw new XMLSecurityException("empty", ex);
    }
  }

  /**
   * @inheritDoc
   */
  public String getBaseLocalName() {
    return Constants._TAG_RSAKEYVALUE;
  }
}
